Sidewalk-door.



No. 879,200. PATENTED FEB. 18, 1908.

' 0. R. SGHRADER.

SIDEWALK DOOR.

APPLIOATIOH FILED NOV. 15.1901.

WITNESSES ATTORNEY.

UNITED STATES PATENT OFFICE. T

OTTO It. SUHRADER, OF SAN FRANGISOO, CALIFORNIA.

SIDEWALK-DOOB.

fectively prevent leakage of-water from the sidewalks to the basement orvault underneath.

in the accompanying drawing, Figure 1 is a pers ective view of an opensidewalk door embo ying my improvements; Fig. 2 is an enlar edlongitudinal section of the door, closed; Fig. 3 is a still moreenlarged plan View of a corner of the door.

Referring to the drawing, 1 indicates the I-beams of the sidewalk, and 2the concrete sidewalk itself. Upon the concrete, immediately over twoLbeams are supported plates 3, which are arranged in a rectangular form,and form the lower portion or base of the frame of the door. Upon eachplate are secured by rivets 4 the horizontal members of inner and outerangle irons 5, 6, the vertical members of the outer angle irons beinghigher than those. of the inner. Said inner and outer angle irons thusform a trough 7, rectangular in form, extending around the opening inthe sidewalk, and from one corner of said trough. 7 extends a dischargepipe 8 for carrying off water draining into said trough 7. To thevertical members of the outer angle irons are riveted the fixed straps 9of hinges 10, the movable straps of which are'secured to the members 11,12, of the door proper. The free edge ofthemember 1] of the door hassecured to its underside a T-bar 13, a spacing strip 14 being interposedbetween the inner edge of the cross member of theT-bar and the free edgeof the door, and a spacing strip 15 is also secured to the outer edge ofthe cross member of the Tbar, upon which spacing strip the free edge ofthe other door member 12 can rest when the door is closed. There isthereby formed a channel or trough 16 to receive any water passingbetween the free edges of the door members when closed. The verticalmembers of the inner angle irons at the sides have recesses 17 outtherein to receive the ends of the hori- Specification of Letters PatentApplication filed November 15. 1907. Serial No. 402.264-

Patented Feb. 18, 1908.

zontal portion of the T-bar, so that the trough formed therebydischarges water therefrom into the rectangular trough 7 formed betweenthe inner and outer angle irons of the frame of the door.

In prior constructions of. frames for sidewalk doors, the arrangement ofthe parts forming this rectangular trough has been such that it wasdifficult, if not impossible, to completely surround the rectangulartrough with concrete, owing to the difficulty of tamping in the concretearound the trough, by reason of the horizontal members of the frameextending outwards from the upper portion of the trough. On this accountit ias been the practice to completely surround the trough with concreteonly at the u er portionof the trough, leaving an unfdi ed space allaround the lower portion of the trough. With my constructlon suchdifliculty does not occur as the outwardly extending portions of theframe extend from the lower portion of the trough, so that it is quiteeasy to tamp the concrete completely around the frame and to completelylnclose the same with concrete.

In the former constructions, improved by my invention, on account ofthere having been left, an empty space all around the trough at thelower portion thereof, there resulted a collection of water at suchpoints outside of the trough, causing the rusting of the metal incontact therewith, and the gradual deterioration of the frame of thedoor and of the concrete so that eventually there results aconsiderable-leakage of water into the basement or vault.

With my present construction, the trough can be so tl'ioroughly inclosedwith concrete that there is no vacant space whatever around the frame,and the latter, being completely protected from the action of theelements will last for an indefinite time.

Upon the under surface of the door member 12, near its edges are securedangle irons 20, which form a rectangular frame following thcoutline ofthe edge of the door member, and thus strengthening said door member,and the horizontal portion 21 of the angle iron, near the hinged edge ofthe door member 12, rests upon the upper edge of the inner angle iron ofthe door frame, while the vertical member of the angle iron extendsdownwards about midway of the trough 7, and thus forms a shield toprevent water passing from the opening between the hinged edge of l thedoor and the outer member of the trough over the upper edge of the innermember of said trough. In like manner, the other member 11 ofthe doorhas a similar angle iron 21.

secured to the under side thereof near its hinged edge.

As shown in Fig. 3, the inner end and outer angle irons, which are laidupon the plates 3, are extended to overlap said plates at the corners,that is, a plate at one side of the door frame is extended, as shown indotted lines at 22 to a point in line with the outer edge of the plateat the adjacent side; the inner angle iron of the latter side is thenextended over the joint 22, as shown at 23, to abut against the end ofthe inner angle iron of the first side, and similarly for the outerangle irons. In this way the joints of the angle irons are placed as faras possible from those of the base plates 3. The inner vangle irons aresecured together at the corners by angle pieces 24.

The novel feature of this invention is the ,construction of the parts ofthe frame so as to form a rectangular trough to catch water passing theedges of the doors, while at the same time permitting the concrete to beeasily and effectively placed around said frame so as to completely fillthe space around the same.

I claim v 1. A frame for sidewalk doors comprising plates arranged in aplane to form a rectangular frame, and inner and outer angle ironsresting on, and secured to, said plates, the

horizontal member of each angle iron extending outwards from thevertical member thereof, and the horizontal member of the inner angleiron terminating in close contact 40 with the vertical member of theouter angle iron, substantially as described.

2. In a frame for side walk doors, the combination of plates arranged inthe same plane to form a'rectangular frame, and inner and outerangleirons for each side of the frame,-

the horizontal member of'the inner angle iron extending outward from thevertical member and secured to the base plate to form with the verticalmember of the outer angle iron atrough, and the lmrizontal member of theouter angle iron resting on and being secured to the base plate, to formupwardly openingcorners, or angular spaces around the frame, arrangedtobe readily lilled with concrete to the level of the vertical membersof the outer angle irons, substantially as described.

3. In a frame for sidewalk doors, the combination of base platesarranged in the same plane to form a rectangular frame, and inner andouter'angle irons for each side frame, the horizontal members of theangle irons resting on the base plate and being secured thereto anddirected outwards from the vertical members, and the horizontal membersof the angle irons being extended at the corner of the frame over thejoints between the base plates, substantially as described.

4. In sidewalk doors, the combination of a frame having a trough orchannel beneath the edges of the doors, and doors hinged thereto, eachhaving an angle iron secured on the under side thereof adjacent to thehinged side of the door, the horizontal member of said iron resting uponthe inner side of the trough and the vertical member depending into saidtrough, substantially as described I In testimony whereof I havehereunto set my hand in the presence of two subscribing witnesses.

OTTO .R. SC] I RA DE R.

Witnesses:

FRANCIS M. Wmen'r, D. B. RrcnARns.

